AC - Use a square wave arc that is extinguished for shorter periods. (Good for aluminium).

Different types of tungsten electodes are available:

Thoriated tungsten is good for stainless steels and copper. Used in DCSP mode (electrode is negative). This is not suited for aluminium.

Zirconiated tungsten is good for aluminium, used in AC mode.

Ceriated tungsten is good for all metals in AC & DC modes.

Aluminium melts at 600°C and gomes in different grades:

1000 series is the lowest.

5000 and 6000 series is marine grade (most common)

7000 series is aviation grade and becomes brittle when welded.

Filler wire needs to match material.

Grinding tungsten on a grinder shared with steel may contaminate the electrode with steel particles.

Use a stainless steel brush to clean any aluminium surfaces. A steel brush will contaminate the surface.

Hi! Subconsciously you already know this, but let's make it obvious. Hopefully this article was helpful. You might also find yourself following a link to Amazon, Lego or eBay to learn more about parts or equipment. If you end up placing an order, I make a couple of dollarydoos. We aren't talking a rapper lifestyle of supercars and yachts, but it does help pay for the stuff you see here. So a massive shoutout to everyone that enables this place. Thanks!